The calculated distance (air line) between Goyang-si and Yangp'yŏng is approximately 38 miles respectively 61 kilometers.
By car or train, the actual journey to Yangp'yŏng is certainly longer, as only the direct route (as the crow flies) between Goyang-si and Yangp'yŏng has been calculated here.
Air line (approximately)
61 kilometers
33 nautical miles